spotlight

main.cpp

@@ -79,13 +79,15 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 	gpuProgram.DetectUniform("U_DiffuseLightColor");
 	gpuProgram.DetectUniform("U_DiffuseMaterial");
 	gpuProgram.DetectUniform("U_LightPos");
+	gpuProgram.DetectUniform("U_LightDirection");
+	gpuProgram.DetectUniform("U_Cutoff");
 	gpuProgram.DetectUniform("U_SpecularLightColor");
 	gpuProgram.DetectUniform("U_SpecularMaterial");
 	gpuProgram.DetectUniform("U_EyePos");
 
 	//init 3d model
 	ObjModel model;
-	model.Init("res/model/Sphere.obj");
+	model.Init("res/model/Quad.obj");
 
 	float identity[] = {
 		1.0f,0,0,0,
@@ -97,12 +99,14 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 	float ambientMaterial[] = { 0.2f,0.2f,0.2f,1.0f };
 	float diffuseLightColor[] = { 1.0f,1.0f,1.0f,1.0f };
 	float diffuseMaterial[] = { 0.6f,0.6f,0.6f,1.0f };
-	float lightPos[] = {3.0f,3.0f,0.0f,1.0f};
+	float lightPos[] = {0.0f,1.5f,-3.0f,1.0f};
+	float spotLightDirection[] = {0.0f, -1.0f, 0.0f, 1.0f};
+	float spotLightCutoff = 15.0f;
 	float specularLightColor[] = { 1.0f,1.0f,1.0f,1.0f };
 	float specularMaterial[] = { 1.0f,1.0f,1.0f,1.0f };
 	float eyePos[] = { 0.0f,0.0f,0.0f };
 
-	glm::mat4 modelMatrix = glm::translate<float>(0.0f,0.0f,-3.0f);
+	glm::mat4 modelMatrix = glm::translate<float>(0.0f, -0.5f, -3.0f) * glm::rotate(-90.0f, 1.0f, 0.0f, 0.0f)*glm::scale(2.0f,2.0f,2.0f);
 	glm::mat4 projectionMatrix = glm::perspective(50.0f, 800.0f / 600.0f, 0.1f, 1000.0f);
 
 	glm::mat4 normalMatrix = glm::inverseTranspose(modelMatrix);
@@ -138,6 +142,8 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 		glUniform4fv(gpuProgram.GetLocation("U_DiffuseLightColor"), 1, diffuseLightColor);
 		glUniform4fv(gpuProgram.GetLocation("U_DiffuseMaterial"), 1, diffuseMaterial);
 		glUniform4fv(gpuProgram.GetLocation("U_LightPos"), 1, lightPos);
+		glUniform4fv(gpuProgram.GetLocation("U_LightDirection"), 1, spotLightDirection);
+		glUniform1f(gpuProgram.GetLocation("U_Cutoff"), spotLightCutoff);
 		glUniform4fv(gpuProgram.GetLocation("U_SpecularLightColor"), 1, specularLightColor);
 		glUniform4fv(gpuProgram.GetLocation("U_SpecularMaterial"), 1, specularMaterial);
 		glUniform3fv(gpuProgram.GetLocation("U_EyePos"), 1, eyePos);

res/shader/test.fs

@@ -1,6 +1,8 @@
 uniform vec4 U_AmbientLightColor;
 uniform vec4 U_AmbientMaterial;
 uniform vec4 U_LightPos;
+uniform vec4 U_LightDirection;
+uniform float U_Cutoff;
 uniform vec4 U_DiffuseLightColor;
 uniform vec4 U_DiffuseMaterial;
 uniform vec3 U_EyePos;
@@ -13,6 +15,11 @@ varying vec3 V_WorldPos;
 
 void main()
 {
+	//½Ç¶Èת»¡¶È
+	float radianCutoff = U_Cutoff * 3.14 / 180;
+	float cosThta = cos(radianCutoff);
+	vec3 spotLightDirection = normalize(U_LightDirection.xyz);
+
 	//ambient
 	vec4 ambientColor = U_AmbientLightColor * U_AmbientMaterial;
 
@@ -36,17 +43,22 @@ void main()
 		distance = length(U_LightPos.xyz - V_WorldPos);
 		attenuation = 1.0 / (constantFactor + linearFactor * distance + expFactor * distance * distance);
 	}
+
+
+	L = normalize(-L);
+
 	vec3 N = normalize(V_Normal);
 
 
-	float diffuseIntensity = max(0.0, dot(L,N));
-	vec4 diffuseColor = U_DiffuseLightColor * U_DiffuseMaterial * diffuseIntensity * attenuation;
+	float currentCosThta = max(0.0, dot(L,spotLightDirection));
+
+	float diffuseIntensity = 0.0;
 	
-	//specular blin
-	vec3 viewDir = normalize(U_EyePos - V_WorldPos);
-	vec3 M = normalize(L + viewDir);
-	vec4 specularColor = U_SpecularLightColor * U_SpecularMaterial * pow(max(0.0, dot(M,N)), 64.0)  * attenuation;
+	if(currentCosThta > cosThta){
+		diffuseIntensity = 0.8;
+	}
 	
+	vec4 diffuseColor = U_DiffuseLightColor * U_DiffuseMaterial * diffuseIntensity * attenuation;
 
-	gl_FragColor = ambientColor + diffuseColor + specularColor;
+	gl_FragColor = ambientColor + diffuseColor;
 }